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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '44443c4e79aceeb1876ee4d152622d669095fe46e6c999f03f7353761f35ef1a' 
  AND token = 'FDCsWfMbzLxDUOUFK+H7vheWlusbw1a6LZ/lVoTnTLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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