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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '7e822026012327ccd3775c89c7e0b367eba9f50b16d911091d7881035467f0ec' 
  AND token = 'LD5gyCzoO17PCyrX9itdDb1r5cwOFN6TmRRlQkjLcm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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