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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '5e59d097efd141a5b07d6c5ca02d84f47fd82f0b33984c9c4d7bb0ba3d80bd56' 
  AND token = '66PNQ2JqDWDwuVMMoVtNcxnZ5tmRGRlA94VfEtgy4Hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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