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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '6826471d3673e42b8235ecdd8d8685f9c9956ea40b74071b6a7fa7e8e5432dac' 
  AND token = 'ttogSAReb6EJPg5Xi4PIwI2Y9VmAy+2BbLUyeIBXAUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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