SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fac9feec11b687f26b3b9d8d0d1ddaf271d7106a93c6384e226d06c9f2c7c813' 
  AND token = 'qUjWiBTymhwGKeh897cygA/q9MO5vG6FCPMsubmyLW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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