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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '9d1c81ec1336fc4707cc7078ce3e0168aeeb68aa2d65c3594424288cbbfcd8c8' 
  AND token = 'cty+AfuSqECJttLWPYzTflKJZL2OcXq4IQPr3qgKD/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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