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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '3df720375baa796bfca47991b301af8666de21cb5ac5f262097553c442e0cbe7' 
  AND token = 'bznnV6LW/5kcDtpLjUfrxYOPuhLH9WdA3s8QQf8/I54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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