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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '6302dc27d8e4241b1e9a5f6415090af7e3fd08ff55778d1cc39543afbd58aaaf' 
  AND token = 'ucaxbiijbMtkv1EMTpglii9pff9WKIyvV9CVchPwrgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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