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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c7560c574fb132faca6a9d8097202b47695031d62878789de47615ca53fdb118' 
  AND token = 'GLCgTyJoe8iIF0dN0Q7xKMl6INDof29Xe7pg4E27W9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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