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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'aa7dd743b8f4677947b40a4780854ecbd637738822bc9c094ac3bad9a7e12cc5' 
  AND token = 'r/yhgO9PsD7E9EnrnVqXggU1caNGEnSvJIaVVgdumj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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