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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3ca17885706830c21b3d2d0ce530f74492963acba5d3009d89f2bfc43e6e6c63' 
  AND token = 'idD+Pom/mstRUF8iML4Etuq86IntZTow6iUgg9q0gBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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