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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '8812c60a50a69b9c1f10a8f3e52ef06e041ab3420db3516a21578d4b78738c5e' 
  AND token = 'S718oABihMH6FzY2ghMR1t4Edg48ZgQb/A6feNliquo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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