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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '23f508907d674fbaa1161150ce8a4ac1b7b9502c75aa1ca067dd1ac381dad826' 
  AND token = 'r+MWp48a5XgPcE/8OocNGIEtR4b64MrnWGAlUFGfzX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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