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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e396681d7c73c87f183c3999e4d2a1ff46082cd2b2edcaa224da498b4062ecab' 
  AND token = 'O+HYnkJjqTKSDj09ztURH7ti3GjJ+ql6QH7Aew2HOEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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