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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'b6639da4b3e9333797c7efb7908e023d6e3a723df127e38aedce8027ebec6b6e' 
  AND token = 'qwWugcRYQoiGYKsdVpLDOm2K6rsytVdr5wNZDBRUQho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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