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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c1af657200755a9f4cdc868bde76646f010785012cdec027546d5023397a37d3' 
  AND token = 'eG4DkgMRD1R6tmAS+hWiklHYZElGhK9owuxxS+iFQII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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