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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8e5488a52902d603d191e16f468c42919be4a262e130a20fc7ef2d61f8c24ca3' 
  AND token = 'S3P1M8QowETQ+A8iGIpxaCS7JTHz15V0gN7DmnT7zIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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