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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '30ca158f8f80e7c311ec41761f9e53bf57e7c5584db2ce149f5af3babf4e7e09' 
  AND token = '37VVbWvRI9ojTs3RaMNovWIGxWR1PS+WdNbdW0GUtiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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