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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd20bae4f51e3418e01da55d7f5143bf5870b1ae46a246201d47cbdf77ff81fe2' 
  AND token = 'FsYDSkEOezofg/Is9R6qU2d/VraaxwyEnsPIii4ppLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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