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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '8c3e92c8a23301a9c60f0ab685b5e4b31ca187a1eabae48f4f80f119b791ee7e' 
  AND token = 'CePpRrZeGbF1jsVVZWCHU3V1G3z9kUYDLSvd5H+dVCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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