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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '091d52094cfb65978657bf7b2b797f26ce6fe0817d381c714110c03c5d9375e2' 
  AND token = '+NHAuKPE+SjPO/3OzUUuwxOTZH1kyds4UINET00nWGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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