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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'aa9374cad2417daa0120c5056d01d090e41d8c4057c08152d75b5d69cc80f0b3' 
  AND token = '/1nWx5srMcPqv32URy32KqN1kjIBPtFv9L+0hP0DWNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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