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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e89c38a44255c3a0659a6420800a6f46e02a7da352f531b3e0dc494ec9a71752' 
  AND token = 'i613en9oQAwlVvp3TUQLjxPqFyO7ShWuzXopQ+AdAKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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