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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '0c27eb85df11225aaaf47c97229ee53541ec59939ddd1c7e7084aebbf07f9f40' 
  AND token = 'tMRLJcNyeeHNdMrz/VxJ9jbP3KLSOWzKGzprsHR3kJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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