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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '857b34277b69e8066591953f41f6d6f4b4fbb5ca474e5bdf7151f39328e54412' 
  AND token = 'nMs0pqVTEqC+qJq5Eonq+1FqV+GnFqRjAp9OI712NRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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