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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '876b09d9c00bc40d5d5c8c10cf3e0b6865ff9aed57ddcb58f0caf722c4cbc6bf' 
  AND token = 'E426Q5Kmmba/jr9T4T7vjOcDLnK8CXLNFFbSBdCEAx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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