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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '89b7653730a1147f4323432854969007da5216ed9d4859a1d5a9a9d26145f573' 
  AND token = 'YbwfuEkEyI63mFw8NNM6uHzIFt2QqWmuBxDdTOn0hsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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