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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '3c9dca075ab4a914a5cd86d867da0c0c1f9c62d5fc5ff5d39221963d0e0697eb' 
  AND token = 'PJa9g+1JBKorVG3GLeLi5t+EsMZ6+jjQO0f6Ih58dRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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