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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '874d048f7e108aa28dc26bcadd311b1ce3022c7834d5955d4da9f59cd0bc78c6' 
  AND token = 'ZUWwNz8nXN5zkHIlk9FhBtWppGfdPdgBsb7Z3LS25vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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