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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0054b0048c42f899b55a8e183b21f48f3470279b5cffa12fa716bd88e3dec30c' 
  AND token = 'jjLU8I4Plp8sdJxeap96kYeAGzI5PjYHZjEXPwBc3WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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