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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f09550efdac38ece123b8050e862a172d2c131a567ead5482fe4d21c03f0e1a7' 
  AND token = '8b8jvGdqshli+C1bFyzicOvMbXPQbuaJWNc8DfK82q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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