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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '8c981fee66a64c54cb6511d6b62efdf5c77a03b8e8184c81f2305069c0d90b69' 
  AND token = 'pz3dSE7o4TauLBotaD2jtI5rXtLZkdPqk9/7QAfibsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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