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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b9402284a7357521690f8c87bece9f0a120ffa2b9ad7c7f442299d0fc6808667' 
  AND token = 'VpvrTEBsF47aPzS1SxSyOKNKzVRiYHOnr5fn7S0r04U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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