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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c465127025f8676b31b72eae0c870c3d897caf280c7c77c1bad19cca20e966b7' 
  AND token = '6pPshq5m8wkiegfCpfG24md55ulH55iElQI4NHJIRho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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