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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '41c04ec53018a78ebe70e637e6e3c5302cc587797f0ce98a1d212dcef39a36c2' 
  AND token = 'bRNpq4mUVjhVKeMf5n0pJiV8D/wkuVhtcbuIGAKm+1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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