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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cd9303fd14dddcd1a426638c8e0f0d05e0dbc07e106860bbbe1384607044fa9' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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