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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b7213b049bd4b5b3425ecc6eb044059bbe65e3f23a62e2d177f878d9eddf568' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}