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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'bc2761814863274bcf3087464ff655023f33bd97d6ce5ea076b9da5c1cc6d337' 
  AND token = 'R77XylaIuBiek26A/nPE8rYkGGxjY1vx5dO6oT4TL80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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