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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6775ff4ebd1ebd0003136c954f9fd20ab1969563fa75e02a30d9a008a0150cfa' 
  AND token = 'zIDatQGNGHMFwKhOaAt4zBlPXc876bg77onhmy8NDgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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