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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a3ba14c2082ff53182cd2f0d482a4421466658fd5d08389646891ce8f0ec9f2b' 
  AND token = '7b5O+TeOgmOmcBbfNjGt0RLspBNVQjRYrEG9x8ui5EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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