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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '3e8795a323c426d38398e5e0a1817a076ca2f6ec3f470f5ebf4328e09a1a55d9' 
  AND token = 'TYSVEzyyyAWE4U9pE+z9HSbcS4WbaZA2Qr62RPfqxrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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