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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5389b71fcccc4f563a0c732acf0c28c4868ef77f0cc87de4c08d206d5e419961' 
  AND token = 'cp77oTgx0aiCUV7eNPFQuiwC9hJ2Cooiv3jkZvVmbTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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