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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7986d5018fd57f63eecc1ab11fdf08a191abee648e2d134e99e3807585b94261' 
  AND token = 'cmweQK+FNkC3F+Vg9CVept/p39dN4kP9i1nKJRyUkFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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