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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1b62039a67f3e7d95ff1e3a72e2033fefce24e735c3192faa39cfbf00dc40933' 
  AND token = 'tw6AgSjUj5l5b6Tyn/3ATSOjot/b8pvOPg9rXMszoEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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