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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a7fd6b36f842c275a9b82d06760b0e558cf3d4aa605b1ea977dda27bf971dc2b' 
  AND token = 'dctyccqVVOjqnTGJoV1H+i4YBnE6EEUso11yBFeoTHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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