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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ec5516188d14510c0d0480d98989d27498cf854f1e6d6dd7abff2aa0efcd2a92' 
  AND token = '1sE0RhJ6JdBWjXtfT++rdM+u49Z/3wvSgepwjqv20EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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