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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'aec043102484a1fc9aa654eaf89e71700b5e3e9c89bdb47d8e22693c78acc2a9' 
  AND token = 'BG53H6FsJ1XQa9oRFGk9WGIjjsbFgM1mfoReJ2AAldc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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