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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '3cfcc8f04dfb9985e91f7cd618cc7f4293122a4d51d71a128863b95dc34a2ae2' 
  AND token = 'Wk1pIy3qA0w/LOScDeUwt2/PXJ/4w6YnVRXWCs0fmxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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