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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '402d73a37f35c291a38e8e969e3fa6799977a1cd2a2d4dbbd4592454c8d63fca' 
  AND token = 'x3wCxZZIX0CS43N2JbX9X1U2ehheKEEJvTczaaau2gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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